1. I'm reading. 2. He is writing. 3. We aren't working. 4. Are you reading?
5 Is he sleeping? 6. Nick and Mike are playing football. 7. Kate is playing the piano. 8. She isn't singing. 9. My sister is sleeping. 10. Is Dad drinking tea? 11. Are your parents drinking tea? 12. I'm not sleeping. 13. She's sitting at the table. 14. We're doing an exercise. 15. We aren't bathing. 16. They are playing in the yard. 17. Nina and Ann are mopping the floor. 18. Nick is helping his mother. 19. Are you helping your dad?.20. My sister is reading an interesting book. 21. They are going to school. 22. Are you going to school? 23. Is he working? 24. Is your grandmother going to the shop? 25. He is buying sweets. 26. What's your sister doing? 27. Where are the children playing? 28. Why are you laughing?
2) 5*4=20 (руб.) - стоят 4 пирожка.
ответ: 20 рублей стоят 4-е таких же пирожка.